JP4799635B2 - Liquid desiccant regenerator and desiccant dehumidifier air conditioner - Google Patents

Description

  The present invention relates to a liquid desiccant regenerator that regenerates the dehumidifying ability of a desiccant solution and a desiccant dehumidifier air conditioner equipped with the regenerator.

  Conventionally, desiccant dehumidifying air conditioners are characterized by the fact that they do not use chlorofluorocarbon refrigerants, have low power consumption, can use low-quality energy such as exhaust heat, and have a sterilizing / sterilizing action. Among them, an apparatus using a liquid as a desiccant (dehumidifying agent) has a higher dehumidifying ability than those using a solid and has recently attracted particular attention. In a dehumidifying apparatus using this type of liquid desiccant, the desiccant aqueous solution is circulated between the dehumidifier and the regenerator to dehumidify the processing air. Specifically, in the dehumidifier, the process air is taken into the dehumidifier and brought into contact with fine droplets of the desiccant solution (concentrated solution) ejected from the nozzle to adsorb the moisture in the process air into the solution, thereby dehumidifying it. To do. The desiccant solution (dilute solution) having a reduced concentration and reduced dehumidifying ability due to the adsorption of moisture is sent to the regenerator. In the regenerator, the dehumidifying ability is regenerated by heating the dilute solution with reduced moisture absorption capacity, ejecting it from a nozzle in a state that facilitates the release of moisture, and bringing the regeneration air into contact with the ejected solution to give moisture to the regeneration air. However, it is made to return to a dehumidifier (for example, refer patent document 1).

  In this type of desiccant dehumidifying air conditioner, improvement of the energy efficiency of the entire system is desired, and as a problem, a regenerator capable of reducing the energy required for regenerating the dehumidifying ability of the desiccant aqueous solution is desired. Therefore, in recent years, a two-stage regeneration method that can reduce energy consumption has been proposed.

  In the two-stage regeneration method, the steam generated by the primary heating in the first regenerator is used as a heat source for the secondary heating in the second regenerator, thereby improving the energy efficiency of the entire regenerator. . In a two-stage regeneration type regenerator, a liquid desiccant solution is heated in a first regenerator to evaporate water in the desiccant solution, and the vapor is sent to a second regenerator equipped with a heat exchanger. In the second regenerator, the steam from the first regenerator is sent into the heat transfer tube of the heat exchanger inside the second regenerator, and the desiccant solution from the first regenerator is sprayed on the heat exchanger, and at the same time, Contact regeneration air with the desiccant solution. As a result, the desiccant solution is heated by exchanging heat with the steam in the heat exchanger, and at the same time, the moisture in the desiccant solution is given to the regeneration air to regenerate the dehumidifying ability of the desiccant solution. In this way, the desiccant solution heated and concentrated in the first regenerator is further concentrated in the second regenerator using the vapor of the first regenerator, thereby improving the thermal efficiency.

JP 2008-111644 A (4th page, 5th page, FIG. 1) Japanese Unexamined Patent Publication No. 60-241901 (2nd page, FIG. 1) JP 61-149229 A (2nd page, 3rd page, FIG. 1)

  In a conventional dehumidifier and regenerator, a desiccant solution is sprayed from a nozzle, and treated air or regenerated air is brought into contact with the sprayed solution. For this reason, a desiccant solution may be scattered outside by this air flow. Therefore, in Patent Document 1, a filter and a demister (a kind of filter) are provided, and the droplets are removed from the air flow by passing the air flow through the filter, and are prevented from scattering outside. However, installing a filter or demister increases the pressure loss and consequently increases the fan input. There are also various problems such as the need for maintenance to prevent clogging of the filter and demister.

  Further, in Patent Document 2 and Patent Document 3, it is possible to improve thermal efficiency by adopting a two-stage regeneration method. However, when the desiccant solution is brought into contact with the regeneration air in the second regenerator, the desiccant solution is sprayed from the nozzle. For this reason, the problem of scattering of the desiccant solution to the outside still remains, and improvement has been demanded.

  The present invention has been made in view of the above points, and a liquid desiccant regenerator capable of improving regeneration efficiency and, in turn, improving the efficiency of the entire system, and a desiccant dehumidifying air conditioner equipped with the regenerator. An object is to provide an apparatus.

  The liquid desiccant regenerator according to the present invention has a high stage regenerator, a low stage regenerator, and a condenser, and the desiccant solution supplied from the outside is supplied separately to the high stage regenerator and the low stage regenerator. In addition, the heat transfer fluid is circulated between the low stage regenerator and the condenser, and the high stage regenerator generates steam by heating the desiccant solution supplied from the outside with a heating source. In addition to regeneration, the steam generated by heating the desiccant solution is supplied to the condenser as a heat transfer fluid circulating source between the condenser and the low stage regenerator. The steam from the lower stage regenerator is brought into direct contact with the heat transfer fluid from the lower stage regenerator, and the steam from the higher stage regenerator is condensed and liquefied to become part of the heat transfer fluid, while the heat transfer fluid from the lower stage regenerator is Heated with steam from the high stage regenerator and returned to the low stage regenerator. A structure in which a plurality of plates having passages through which heat transfer fluid passes are arranged in parallel at intervals, and a desiccant solution supplied from the outside flows down along the outer surface of each plate to form a liquid film The desiccant solution supplied from the outside and the heat transfer fluid heated by the condenser are subjected to heat exchange inside and outside the plate to heat the desiccant solution, and the heated desiccant solution has a gap between each plate. The regeneration air passing therethrough is brought into contact, and the water in the desiccant solution is released to the regeneration air to regenerate the desiccant solution.

  According to the present invention, the regenerator is a two-stage regenerator including a high-stage regenerator and a low-stage regenerator, and doubles the heat energy input from the outside. Can be improved and the COP of the system can be greatly improved. Further, since the plate type heat exchanger is used as the low-stage regenerator, the desiccant solution droplets are hardly generated when the desiccant solution is regenerated. Therefore, it is possible to prevent the desiccant solution droplets from being scattered outside by the processing air or the regeneration air without using a filter or a demister.

1 is a schematic diagram illustrating a configuration of a liquid desiccant dehumidifying air conditioner including a liquid desiccant regenerating apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a configuration of a reproducing unit in FIG. 1. It is a schematic diagram which shows the structure of the high stage regenerator of FIG.

Hereinafter, a liquid desiccant dehumidifying air conditioner according to an embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing a configuration of a liquid desiccant dehumidifying air conditioner. FIG. 2 is a schematic diagram showing the configuration of the reproducing unit 20 in FIG.
The liquid desiccant dehumidifying air-conditioning apparatus 1 includes a dehumidifying unit 10 that dehumidifies by adsorbing moisture in the processing air with the desiccant solution, a regenerating unit 20 that regenerates the desiccant solution having a reduced dehumidifying capacity due to dehumidification, and a solution. And a heat exchanger 33. The dehumidifying unit 10 and the regeneration unit 20 are connected to each other by a concentrated solution tube 31 and a diluted solution tube 32, and a desiccant solution (for example, a lithium chloride aqueous solution or an odorous lithium aqueous solution) is concentrated while changing its state to a concentrated solution or a diluted solution. Circulation is performed by a solution pump 34 and a dilute solution pump 35. The solution heat exchanger 33 is provided in the middle of the circulation path between the dehumidifying unit 10 and the regenerating unit 20 (in the middle of the concentrated solution tube 31 and the dilute solution tube 32), and a dilute solution heading from the dehumidifying unit 10 to the regenerating unit 20; Heat exchange with the concentrated solution returning from the regenerating unit 20 to the dehumidifying unit 10 is performed. Hereinafter, the desiccant solution may be referred to as a concentrated solution or a dilute solution depending on the state.

Hereinafter, each of the dehumidification part 10, the solution heat exchanger 33, and the reproduction | regeneration part 20 is demonstrated in detail.
The dehumidifying unit 10 includes a dehumidifier 11 that dehumidifies by adsorbing moisture in the processing air with a desiccant solution, and a blower 12 that takes indoor air (processing air) into the dehumidifying unit 10 and blows air to the dehumidifier 11. I have.

  The dehumidifier 11 is configured by a plate heat exchanger having a configuration in which a plurality of plates 11a are arranged in parallel at predetermined intervals. The dehumidifier 11 has a distributor 13 for distributing the concentrated solution to each plate 11a, and the concentrated solution distributed by the distributor 13 is applied to the surface of each plate 11a from the upper side of each plate 11a. It flows down while forming a film. The room air (process air) taken in by the blower 12 passes through the gaps between the plates 11a, the liquid film on the surface of the plate 11a comes into contact with the process air and adsorbs moisture in the process air, Dehumidify. The desiccant solution (dilute solution) thinned by adsorbing moisture in the processing air in the process of flowing down the surface of the plate 11a is discharged from the lower part of the dehumidifier 11 to the outside of the dehumidifier 11 for solution heat exchange. Is supplied to the vessel 33.

  Further, a cold water passage through which cold water as a cooling fluid supplied from the outside through the cold water supply port 11b passes is formed inside each plate 11a, and the cold water passing through the cold water passage and the liquid on the surface of the plate 11a The film exchanges heat with the inside and outside of the plate 11a. Thereby, the desiccant solution is always cooled by cold water and is in a state in which moisture is easily adsorbed from the processing air. The cold water after passing through the cold water passage inside each plate 11a is discharged to the outside from the cold water drain port 11c. Each plate 11a has a structure having a plurality of small-diameter internal channels (cold water passages) to improve heat exchange performance. In addition, cold water is supplied from well water, a cold water manufacturing apparatus, etc.

  The solution heat exchanger 33 exchanges heat between the low temperature dilute solution from the dehumidifying unit 10 and the high temperature concentrated solution from the regenerating unit 20. That is, the low-temperature dilute solution from the dehumidifying unit 10 is supplied to the regenerating unit 20 after increasing the temperature by exchanging heat with the high-temperature concentrated solution from the regenerating unit 20. On the other hand, the hot concentrated solution from the regeneration unit 20 is supplied to the dehumidifying unit 10 after the temperature is lowered by exchanging heat with the low temperature dilute solution from the dehumidifying unit 10. In this way, by performing heat exchange between the dilute solution from the dehumidifying unit 10 toward the regenerating unit 20 and the concentrated solution returning from the regenerating unit 20 to the dehumidifying unit 10, heating of the desiccant solution in the regenerating unit 20 and dehumidification are performed. This has the effect of reducing the energy required for cooling the desiccant solution in the section 10.

  The regeneration unit 20 is a part that regenerates the dehumidifying ability of the desiccant solution whose dehumidifying ability is reduced by adsorbing moisture in the processing air. The regeneration unit 20 of this example employs a two-stage regeneration system, and includes a high-stage regenerator 21, a low-stage regenerator 22, a condenser 23, and a blower 24 that sends regeneration air to the low-stage regenerator 22. Have.

  The dilute solution supplied from the solution heat exchanger 33 to the regeneration unit 20 is divided into two by the high stage side valve 25 and the low stage side valve 26, and the high stage regenerator 21, the low stage regenerator 22, Are supplied respectively. In this way, by flowing separately into the high stage regenerator 21 and the low stage regenerator 22, the COP (Coefficient Of Performance) of the entire system can be improved. This point will be described in detail below. The low stage regenerator 22 and the condenser 23 are connected by a hot water pipe 27, and a heat transfer fluid (for example, water) different from the desiccant liquid is interposed between the low stage regenerator 22 and the condenser 23. It becomes the composition which circulates.

  The high stage regenerator 21 heats the dilute solution sent through the high stage side valve 25 by the heating source 21a to generate steam to regenerate. Further, as shown in FIG. 2, the steam generated by heating the desiccant solution is used as a heat transfer fluid heating source that circulates between the condenser 23 and the low-stage regenerator 22 via a steam outlet pipe 21b. Supply to the condenser 23. As the heating source 21a, exhaust heat from an external device is used. Specifically, low energy such as gas, hot water by a solar collector, exhaust heat of an engine or a fuel cell is used. FIG. 2 shows an example in which hot water is used as the heating source 21a of the high stage regenerator 21, and the high stage regenerator 21 is constituted by an atmospheric pressure boiler here.

3A and 3B are schematic schematic views showing the configuration of the high-stage regenerator 21, FIG. 3A is a schematic plan view, and FIG. 3B is a schematic cross-sectional view.
The high stage regenerator 21 includes a cylindrical container 21A that uses the principle of a cyclone gas-liquid separator. A liquid inflow pipe 21c through which a dilute solution flows is provided on the side surface of the cylindrical container 21A, a liquid outflow pipe 21d through which a concentrated solution flows out is provided at the bottom surface of the cylindrical container 21A, and a steam outflow from which steam flows out to the upper surface of the cylindrical container 21A. A tube 21b is provided. The dilute solution supplied to the high stage regenerator 21 is heated and separated into steam and concentrated solution by rotating in the circumferential direction as indicated by the arrow in the cylindrical container 21A. The separated steam is supplied to the condenser 23 from the steam outlet pipe 21b. On the other hand, the concentrated solution from which the vapor has been separated is discharged from the liquid outflow pipe 21d. Here, the high-stage regenerator 21 is a cylindrical container 21A using the principle of a cyclonic gas-liquid separator, so that the desiccant solution is prevented from being supplied to the condenser 23 together with the vapor.

  The low-stage regenerator 22 has a configuration similar to that of the dehumidifier 11 of the dehumidifying unit 10 and is configured by a plate heat exchanger having a configuration in which a plurality of plates 22a are arranged in parallel at predetermined intervals. The low-stage regenerator 22 has a distributor 28 for distributing a dilute solution to each plate 22a. The dilute solution distributed by the distributor 28 is supplied from the upper side of each plate 22a to the surface of each plate 22a. The liquid flows down while forming a liquid film. Regenerated air taken in by the blower 24 passes through the gaps between the plates 22a, and the liquid film on the surface of the plate 22a comes into contact with the regenerated air to release moisture in the liquid film to the regenerated air. It becomes a solution and regenerates the dehumidifying ability. Thus, the desiccant solution (concentrated solution) that is concentrated by releasing moisture into the regeneration air in the process of flowing down the surface of the plate 22a is discharged from the lower part of the low stage regenerator 22 to the outside of the low stage regenerator 22, It returns to the solution heat exchanger 33.

  Further, a hot water passage through which hot water as a heat transfer fluid flowing from the condenser 23 via the hot water pipe 27 and the heat transfer fluid supply port 22b passes is formed inside each plate 22a. The hot water passing through the passage and the liquid film on the surface of the plate 22a exchange heat with each other inside and outside the plate 22a. As a result, the desiccant solution is always heated by the hot water and is in a state in which moisture is easily released into the regeneration air.

  In addition, the high-temperature heat transfer fluid that has flowed from the condenser 23 through the heat transfer fluid supply port 22b passes through the hot water passage inside each plate 22a, and then passes through the hot water pipe 27 from the heat transfer fluid drain port 22c again. It is configured to return to the condenser 23. That is, the heat transfer fluid is circulated between the low stage regenerator 22 and the condenser 23 by the pump 27a while changing the state to high temperature hot water or low temperature hot water. In addition, the plate type heat exchanger of the low stage regenerator 22 has a structure having a plurality of small-diameter internal channels as a heat transfer fluid passage in the same manner as the dehumidifier 11, so that heat exchange performance is improved.

  The condenser 23 is formed of a direct contact condenser, and exchanges heat by bringing the steam from the high stage regenerator 21 into direct contact with the heat transfer fluid (hot water) from the low stage regenerator 22. By this heat exchange, the steam from the high stage regenerator is condensed and liquefied to become part of the heat transfer fluid, while the heat transfer fluid from the low stage regenerator 22 is heated by the steam from the high stage regenerator 21. Specifically, low-temperature hot water from the low-stage regenerator 22 is sprayed from the nozzles 23a, heated in direct contact with the high-temperature steam from the high-stage regenerator 21, and heated to the low-stage regenerator 22 as high-temperature hot water. return. Here, in the condenser 23, heat transfer fluid is sprayed from the nozzle 23a, but this increases the amount of heat exchange by atomizing low-temperature hot water and increasing the contact area with steam as a heating source. This is to make it happen.

  As described above, when the steam of the high-temperature regenerator is used as a heat source for the low-stage regenerator 22, the steam is not made as steam but is made liquid by the condenser 23 and then supplied to the heat transfer tube in the low-stage regenerator 22. Therefore, it is possible to circulate with little pressure loss in the heat transfer tube.

  Further, the steam supplied from the high stage regenerator 21 to the condenser 23 is condensed and liquefied in the process of heat exchange with the low temperature hot water from the low stage regenerator 22 as described above. For this reason, the amount of the heat transfer fluid gradually increases in the process of continuously regenerating the desiccant solution. Therefore, drainage is appropriately drained.

Hereinafter, the operation of the desiccant dehumidifying air conditioner will be described with reference to FIGS. 1 and 2.
In the dehumidifying unit 10, the desiccant solution flows downward from the upper part of the plate 11 a to form a liquid film, contacts the processing air taken into the dehumidifying unit 10 by the blower 12, and absorbs moisture in the processing air And dehumidify. The dehumidified processing air is released into the room.

  The dilute solution whose concentration has been reduced and the dehumidifying ability has been reduced by adsorbing moisture in the process of flowing downward from the upper part of the plate 11a is sent to the solution heat exchanger 33 by the dilute solution pump 35 from below the plate 11a. Then, it is heated by the solution heat exchanger 33 and sent to the regeneration unit 20.

  The dilute solution sent to the regeneration unit 20 is distributed to the dilute solution A and the dilute solution B by the high stage side valve 25 and the low stage side valve 26, and the dilute solution A flows into the high stage regenerator 21, The dilute solution B flows into the low stage regenerator 22. The dilute solution A that has flowed into the high-stage regenerator 21 is heated by the heating source 21 a, the water in the dilute solution A evaporates to become the concentrated solution A, recovers the moisture absorption capacity, and returns to the solution heat exchanger 33. It is.

  On the other hand, the dilute solution B supplied to the low-stage regenerator 22 is distributed by the distributor 28 to form a liquid film on the surface of each plate 22a. This liquid film is heated by exchanging heat with high-temperature hot water passing through the inside of the plate 22a, and is in a state in which moisture is easily released into the regeneration air. Then, the moisture contained in the liquid film-like dilute solution B is discharged into the regenerated air from the blower 24, becomes a concentrated solution B, recovers the moisture absorption capacity, and is returned to the solution heat exchanger 33.

  Here, the high temperature hot water for heating the dilute solution B in the low stage regenerator 22 is supplied from the condenser 23, and the heating source is generated by heating the dilute solution A in the high stage regenerator 21. Steam. By using the steam generated in the high-stage regenerator 21 as a heating source for the low-stage regenerator 22 in this way, it is possible to reduce the energy required for regenerating the dehumidifying ability of the desiccant aqueous solution.

  As described above, the concentrated solution A and the concentrated solution B regenerated by the high stage regenerator 21 and the low stage regenerator 22, respectively, join and are sent to the solution heat exchanger 33, where the diluted solution from the dehumidifying unit 10 is diluted. After being cooled by exchanging heat with the solution, it is returned to the dehumidifying unit 10 by the concentrated solution pump 36. In the solution heat exchanger 33, the desiccant solution in the regeneration unit 20 is heated and the desiccant solution in the dehumidification unit 10 is heated by exchanging the concentrated solution from the regeneration unit 20 and the dilute solution from the dehumidification unit 10 in this way. Reduce the energy required for cooling.

  The concentrated solution returned to the dehumidifying unit 10 is distributed by the distributor 13 to form a liquid film on the surface of each plate, and is again used for dehumidification of the processing air.

  As described above, in the present embodiment, the regenerator 20 is a two-stage regenerator including the high-stage regenerator 21 and the low-stage regenerator 22, and doubles the externally applied heat energy. Therefore, the heat utilization efficiency can be improved and the COP of the system can be greatly improved.

  Further, when the steam generated in the regeneration process in the high stage regenerator 21 is used as a heat source for the low stage regenerator 22, the steam is condensed and liquefied using the condenser 23 and then supplied to the low stage regenerator 22. ing. That is, when the dilute solution is heated in the low stage regenerator 22, the steam generated in the high stage regenerator 21 is not directly flowed into the hot water passage in the low stage regenerator 22, but the steam is condensed and liquefied. It is made to flow in. For this reason, it becomes possible to circulate the heat transfer fluid (hot water) between the low stage regenerator 22 and the condenser 23 by the pump 27a. Further, since the liquid is supplied to the heat transfer tube 27 in the low-stage regenerator 22, it is possible to circulate with less pressure loss than when steam is supplied to the heat transfer tube 27. As a result, the energy efficiency in the regeneration unit 20 can be improved, and the energy efficiency of the entire system can be greatly improved.

  Further, since the plate heat exchanger is used as the dehumidifier 11 and the low stage regenerator 22, the desiccant solution as in the conventional configuration in which the desiccant solution is sprayed from the nozzle to dehumidify the treated air and regenerate the desiccant solution. The liquid droplet is hardly generated. Therefore, it is possible to prevent the droplets of the desiccant solution from being scattered outside by the processing air or the regeneration air without using a filter or a demister.

  In addition, the amount of heat required in the desiccant regeneration process greatly affects the COP of the entire system. For this reason, exhaust heat from an external device such as hot water from a solar collector, exhaust heat from an engine or fuel cell, heat of condensation, etc. is used as the heating source 21a, so that the COP of the entire system can be improved. It becomes possible.

  DESCRIPTION OF SYMBOLS 1 Liquid desiccant dehumidification air conditioner, 10 Dehumidification part, 11 Dehumidifier, 11a Plate, 11b Cold water supply port, 11c Cold water drainage port, 12 Blower, 13 Distributor, 20 Regeneration part, 21 High stage regenerator, 21A Cylindrical container, 21a Heat source, 21b Steam outflow pipe, 21c Liquid inflow pipe, 21d Liquid outflow pipe, 22 Low stage regenerator, 22a Plate, 22b Heat transfer fluid supply port, 22c Heat transfer fluid drain port, 23 Condenser, 23a Nozzle, 24 Blower 25 High-stage valve, 26 Low-stage valve, 27 Hot water pipe, 27a pump, 28 Distributor, 31 Concentrated solution pipe, 32 Dilute solution pipe, 33 Solution heat exchanger, 34 Concentrated solution pump, 35 Dilute solution pump.

Claims (6)

A high stage regenerator, a low stage regenerator, and a condenser, and a desiccant solution supplied from the outside is supplied separately to the high stage regenerator and the low stage regenerator, and the low stage regenerator And a heat transfer fluid circulate between the condenser and the condenser,
The high-stage regenerator regenerates the desiccant solution supplied from the outside by heating it with a heating source to generate steam and regenerates the steam generated by heating the desiccant solution to the condenser and the low-stage regenerator. Supply to the condenser as a heat source for the heat transfer fluid circulating between them,
The condenser causes the steam from the high stage regenerator to directly contact the heat transfer fluid from the low stage regenerator, and condensates and liquefies the steam from the high stage regenerator to form part of the heat transfer fluid. On the other hand, the heat transfer fluid from the low stage regenerator is heated by the steam from the high stage regenerator and returned to the low stage regenerator,
In the low stage regenerator, a plurality of plates each having a passage through which a heat transfer fluid passes are arranged at intervals, and a desiccant solution supplied from the outside flows down along the outer surface of each plate. The desiccant solution supplied from the outside and the heat transfer fluid heated by the condenser are heat-exchanged inside and outside the plate to heat the desiccant solution, and the heated desiccant A liquid desiccant regenerating apparatus, wherein the solution is brought into contact with regenerating air that passes through a gap between the plates, and water in the desiccant solution is released into the regenerating air to regenerate the desiccant solution.   2. The liquid desiccant regenerator according to claim 1, wherein the high-stage regenerator is a cyclone gas-liquid separation regenerator having a liquid desiccant inlet and outlet on the side and bottom of a cylindrical container.   The liquid desiccant regenerator according to claim 1, wherein the high-stage regenerator uses exhaust heat of an external device as the heating source. It has a dehumidifying part and a regenerating part constituted by the liquid desiccant regenerating apparatus according to any one of claims 1 to 3, and is configured to circulate a desiccant solution between the dehumidifying part and the regenerating part. ,
A solution heat exchanger is provided in the middle of a circulation path between the dehumidifying unit and the regenerating unit, and a desiccant solution from the dehumidifying unit to the regenerating unit and a desiccant solution returning from the regenerating unit to the dehumidifying unit are the solution heat. Configured to exchange heat in the exchanger,
The dehumidifying unit exchanges heat between the cooling fluid circulating between the external device and the desiccant solution, contacts the processing air while cooling the desiccant solution, adsorbs moisture in the processing air, and dehumidifies it.
The solution heat exchanger heats the desiccant solution whose dehumidifying ability is reduced by adsorbing moisture in the dehumidifying unit by heat exchange with the desiccant solution from the regenerating unit, and then sends the desiccant solution to the regenerating unit,
The regeneration unit regenerates the desiccant solution heated by the solution heat exchanger and returns it to the solution heat exchanger,
The desiccant is characterized in that the desiccant solution from the regeneration unit exchanges heat with the desiccant solution from the dehumidifying unit, cools the desiccant solution from the regeneration unit before returning to the dehumidifying unit, and then returns the desiccant solution to the dehumidifying unit. Dehumidifying air conditioner.   The dehumidifying part is arranged in parallel with a plurality of plates having a passage through which the cooling fluid passes inside at intervals, and a desiccant solution is caused to flow down along the outer surface of each plate to form a liquid film, 5. The desiccant dehumidifying air conditioner according to claim 4, wherein the desiccant dehumidifying air conditioner comprises a plate type heat exchanger that exchanges heat between the cooling fluid and the liquid film inside and outside the plate.   6. The desiccant dehumidifying air conditioner according to claim 5, wherein the dehumidifying unit uses well water or cold water produced by a cold water producing apparatus as the cooling fluid.

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